DOSBox vs DOSVisor

DOSBox is a free, open-source DOS emulator for running older programs and games that may not run on newer computers. It emulates 286 and 386 CPUs in real and protected modes, along with XMS and EMS memory. Its graphics support covers Tandy, Hercules, CGA, EGA, VGA, and VESA, while sound emulation includes SoundBlaster and Gravis UltraSound cards. Users can mount floppy and CD-ROM images, including ISO and CUE/BIN formats. DOSBox also supports IPX networking through its internal IPXNET program and can emulate a serial nullmodem cable over a network or the internet. The site identifies version 0.74-3 as the latest version and lists builds or packages for Mac OS X, Windows, Fedora, and Debian, along with source code. Its game compatibility list uses statuses including runnable, playable, and supported. For untrusted files, the site recommends secure mode; that mode disables MOUNT, IMGMOUNT, and BOOT. DOSBox runs on Windows, Linux, and macOS, and the forum is the suggested place to ask about usage or a particular game.

DOSVisor is a Windows project that runs some MS-DOS programs in a virtualized 16-bit real-mode environment using the Windows Hypervisor Platform API. It is presented as a demonstration of that API rather than a complete DOS emulator. Hardware virtualization handles the CPU, while software emulates the DOS layer. A custom Interrupt Vector Table uses CPUID instructions to trigger VM exits and intercept DOS interrupts. DOSVisor captures I/O requests but supports only a small set of common requests. Timing support includes the BIOS counter, RAM refresh toggle bit, system clock, RTC registers, clock interrupts, and DOS current-time calls; the 8253 PIT timer is not fully implemented. Keyboard handling monitors state, keeps a simple buffer, and passes input through interrupts. Basic terminal commands support simple text-based games and other basic programs. BIOS data areas and the Program Segment Prefix are allocated but mostly unpopulated. The free public repository contains bin and src directories, with no releases or packages listed.